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Why is it necessary to use a magnetic core grinder in the production of power modules?

Magnetic core grinding machine is also called magnetic core air gap grinding machine. In the production of power modules, glue is dispensed in the upper and lower magnetic cores. 

After mounting, due to the air gap, the magnetic flux of the magnetic core decreases and does not meet the requirements. The upper and lower magnetic cores need to be pressure ground to remove the air from the glue and meet the magnetic flux requirements.

In the past, this process mainly relied on manual labor, but with the current strict requirements of power modules and magnetic flux control, it is necessary to use a core grinder to grind the magnetic core. Specifically, it holds the lower magnetic core (or the PCBA with the lower magnetic core installed), applies a set left and right force to the upper magnetic core, sucks the upper magnetic core tightly, and then uses the The speed of movement and the number of grinding times. After grinding is completed, it is necessary to check whether the magnetic flux is qualified to set the correct grinding parameters.

Equipment usually includes: high-speed linear drive servo system, visual alignment system, force adjustment and control system, conveyor belt system, MES connection upload monitoring system, laser detection system, etc. to ensure precision and reliability of the process and data tracking. The core grinder is located after the core placement machine and before the curing oven. 

The setting of the grinding force is related to the size of the magnetic core, the glue used, the grinding speed setting, etc. It needs to be determined after passing through the furnace to see if the magnetic flux meets the requirements. The grinding force is an important parameter and needs to be kept precise and constant throughout the grinding process.

As the current requirements for power modules become more and more stringent, the production line is slowly introducing more and more magnetic core grinding machines to correspond to related processes, replacing labor and realizing automation. In order to increase production capacity, it is usually configured with a dual-rail conveyor belt corresponding to a dual-rail placement machine and dual XYZ drive platforms to grind 2 sets of products at the same time. For example, Waltrontech's WT-YM-3000, etc.

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Author: Waltrontech25

Link: https://wenku.baidu.com/view/06ba373e1a5f312b3169a45177232f60dccce7de.html

Source: Baidu Library

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